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Paragonaster
Taxonomy
Paragonaster was named by Sladen (1889) [Sepkoski's age data: J u R]. It is extant.
It was assigned to Valvatida by Sepkoski (2002); to Goniasteridae by Sladen (1889), Clark and Downey (1992), Jagt et al. (2014); and to Pseudarchasteridae by Gale (2020).
It was assigned to Valvatida by Sepkoski (2002); to Goniasteridae by Sladen (1889), Clark and Downey (1992), Jagt et al. (2014); and to Pseudarchasteridae by Gale (2020).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1889 | Paragonaster Sladen |
| 1992 | Paragonaster Clark and Downey p. 255 |
| 2002 | Paragonaster Sepkoski |
| 2014 | Paragonaster Jagt et al. p. 383 |
| 2020 | Paragonaster Gale p. 312 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. Paragonaster Sladen 1889
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†Paragonaster clarkae Blake and Aronson 1998
†Paragonaster haldixoni Jagt et al. 2014
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. M. Clark and M.E. Downey 1992 | A genus of Goniasteridae with stellate form; abactinal plates paxilliform, covered with rounded granules; one median row of abactinals extending to terminal, usually somewhat rectangular in shape and wider than long; adambulacral furrow margin angular; apical oral spine unpaired; no pedicellariae. | |
| A.S. Gale 2020 | Pseudarchasterids possessing narrow, elongated arms in which the superomarginals are separated by a single row of radial plates; arms well demarcated from disc; unpaired interradial marginals absent. |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum | |||||
| References: Blake 1990, Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: base of the Ypresian to the top of the Middle Miocene or 56.00000 to 11.63000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ypresian | Antarctica | P. clarkae (7296 42446) | |
| Middle Miocene | Grenada | P. haldixoni (209746) |